Mechanical control of photocatalysis in 2D ferroelectrics

Strain is a conventional mechanical means for optimizing light absorption of photocatalysts. Herein, an additional degree freedom–ferroelectricity introduced into this process, enhancing not only solar but also photogenerated carrier separation and carrier‐driven forces through opto‐electro‐mechanical coupling. This approach illustrated using 2D ferroelectric material, In 2 Se 3 . The findings show that strain can adjust its bandgap improved solar‐to‐hydrogen efficiency, change polarization to selectively control water‐splitting products. Specifically, manipulation tune the within range 0.5–1.5 eV, thereby better aligning it with spectrum, increasing conversion efficiency 6.6%. Additionally, strain‐induced changes in (internal electric field) alter redox potentials, promoting hydrogen or oxygen reduction on surface by switching. These provide theoretical basis designing efficient